VGG... VGF... VGH... Gas Valves. Siemens Building Technologies HVAC Products VGG... VGF... VGH...

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1 7 636 VGG... VGF... VGH... Gas Valves VGG... VGF... VGH... Single valves of class A for installation in gas trains Safety shutoff valves conforming to EN 161 in connection with SKP... actuators Suitable for use with gases of gas families I...III Valves in connection with SKP... actuators open slowly and close rapidly 2-port valves of the normally closed type 1 ½...DN80 The gas valves are used in connection with electrohydraulic SKP actuators As a control valve in connection with SQX... actuators and an AGA60 adapter (not as a safety shutoff valve) Supplementary Data Sheets on actuators (refer to «Use») The VG... and this Data Sheet are intended for use by OEMs which integrate the gas valves in their products. Use The valves are designed for use - in gas-fired combustion plant - in gas trains of combustion plant - as shutoff or control valves in the supply air line of industrial combustion plant with or without heat recovery system The gas valves provides the following functions: - Shutoff valve (in connection with SKP1...) - Control valve with shutoff feature (in connection with SKP2..., SKP5... or SKP7...) All types of gas valves can be combined with any of the SKP... actuators HVAC Products

2 Warning notes To avoid inquiry to persons, damage to property or the environment, the following warning notes should be observed! Do not open, interfere with or modify the valves! Any opening of the valve, replacement of parts or modifications to the original product is the user s responsibility and is done at his own risk. All activities (mounting, installation and service work, etc.) must be performed by qualified staff When used in connection with gases, the valves constitute part of the safety equipment Fall or shock can adversely affect the safety functions. Such valves may not be put into operation, even if they do not exhibit any damage Engineering notes Profile (only VGG... and VGF...) Owing to the profile of their flaps, the valves are especially suited for control functions. Benefit: Good control performance and hardly prone to hunting in low-fire operation z10/0502 Legend 1 Stem 2 Profile 3 Flap The valves are also available with no profile (refer to «Type summary»). Mounting notes Sealings Ensure that the relevant national safety regulations are complied with When used in connection with actuators type SKP2..., SKP5..., or SKP7..., the pressure switch for lack of gas must always be fitted upstream of the gas valve No special tools are required to assemble valve and actuator The actuator can be mounted or replaced while the valve is under pressure To prevent cuttings from falling inside the valve, first mount the flanges on the pipes and then clean the parts No sealing materials are required to assemble valve and actuator Check to ensure that the valve is tight when all components are connected Only with VGF... / VGH... Check to make certain that the bolts of the flanges are properly tightened Check to ensure that the gaskets between the flanges are fitted Mounting position Direction of flow Function The valve can be installed on the gas trains in any position. The permissible mounting positions of the actuator must be observed, however (refer to the relevant Data Sheet). The direction of gas flow must be in accordance with the direction of the arrow on the valve body. Stem retracts Valve opens Stem extends Valve closes 2/13

3 Installation notes Gas pressure If the available gas pressure exceeds the valve s maximum permissible operating pressure, it must be lowered by an upstream pressure controller. Commissioning notes In case of corrosive ambient conditions (e.g. when used near the sea), the valve body should be coated with protective lacquer Standards and certificates Conformity to EEC directives - Electromagnetic compatibility EMC (immunity) - Directive for gas appliances - Directive for pressure devices 89 / 336 EEC 90 / 396 EEC 93 / 23 EEC ISO 9001: 2000 Cert ISO 14001: 1996 Cert For use in the USA / Canada, the actuators carry type suffix «U» (see example) and are UL-, CSA- and FM-listed. Example: VGG10.204U In connection with SKP... Service notes Each time a valve has been replaced, check to ensure that the valve operates correctly and that it is tight both internally and externally Siemens valves may only be overhauled by Siemens HVAC Repair Centers VGH... valves are supplied without strainer. Fit a gas filter upstream of the valve or an AGA... strainer (refer to «Accessories») by the gas inlet Disposal notes Local and currently valid legislation must be observed. 3/13

4 Mechanical design Actuators The gas valves can be combined with the following types of actuators: Type reference Data Sheet Function SKP ON / OFF SKP ON / OFF SKP ON / OFF SKP ON / OFF with constant pressure control / zero pressure control SKP ON / OFF with constant pressure control SKP27... with SQS ON / OFF with constant pressure control and electric setpoint adjustment SKP ON / OFF with differential pressure control, signal input differential pressure SKP ON / OFF with ratio control, signal input static pressure SKL90... (only for air) 7642 ON / OFF with constant pressure control, slow closing s SQX32... with AGA Modulating position control SQX62... with AGA Positioning signals DC V, Ω or DC ma 4/13

5 Type summary (other types of valves on request) Perm. operating pressure in mbar Europe and Nominal size Material Australia Other (to EN) countries Internally threaded to ISO 7/1 Number of connections Type reference Air flow rate at With profile Without profile p = 1 mbar Test point / m³ / h RP ¼ 3) Pilot gas Without stroke With stroke Without stroke G ¾ limitation limitation limitation 4) 1) ½ Die-cast al VGG10.154P VGG P ¾ Die-cast al VGG10.204P VGG P VGG Die-cast al VGG10.254P VGG P VGG ½ Die-cast al VGG10.404P VGG P VGG Die-cast al VGG10.504P VGG P VGG Cast iron VGG10.804P --- VGG With stroke limitation 1) Flanged, PN16, to ISO 7005 DN40 Cast iron VGF10.404P --- VGF DN50 Cast iron VGF10.504P VGF P VGF DN65 Cast iron VGF10.654P VGF P VGF DN80 Cast iron VGF10.804P VGF P VGF Flap type valves: High-flow with swing type flap High closing force Version without strainer, to DIN, only for use on plants with gas trainer These valves may only be overhauled by Siemens HVAC Repair Centers DN80 Cast iron VGH DN100 Cast iron VGH DN125 Cast iron VGH Legend (also refer to «Dimensions») 1) Cannot be used with attached pressure governor 3) On inlet and outlet side 2) Flow rate reduced by 20 % 4) Inlet side, VGF...: One connection on each side Ordering When ordering, please give the complete type reference. Actuators must be ordered as separate items. Valve and actuator are supplied unassembled. Example: V... Flanged valve VGF10.654P, DN65 5/13

6 Accessories Manual adjuster AGA61 Adapter for actuators SQX... AGA60 Consisting of 2 stem parts and a connecting flange Only for VGH... Strainer for valve With circlip and 1 mm mesh size Type reference of valve VGH VGH / DN100 VGH / DN125 Type reference of strainer AGA80 AGA90 AGA91 The strainers can be fitted in the flange sections of the valves, either on the gas inlet or outlet side. Technical data General valve data Valve class in connection with SKP... A conforming to EN 161 (except with SQX... / SKL...) Group 2 (EN 161) Perm. medium temperature C Weight refer to «Dimensions» Connecting flanges (VGF... / VGH...) PN16 to ISO Required flow rate refer to «Flow chart» Perm. mounting position 7648z09/0603 Operating pressure Types of gases Trainer (only for use with VGG... / VGF...) (refer to «Mounting notes») refer to «Type summary» refer to «Use» built-in, mesh size 0.9 mm Environmental conditions Transport DIN EN Climatic conditions class 2K2 Mechanical conditions class 2M2 Temperature range C Humidity < 95 % r.h. Operation DIN EN Climatic conditions class 3K5 Mechanical conditions class 3M2 Temperature range C Humidity < 95 % r.h. Condensation, formation of ice and ingress of water are not permitted! 6/13

7 Function VGG... / VGF... functioning principle Sectional view of valve 7636z05/0502 Application example VGG... complete with SKP2... Sectional view VGG... complete with SKP1... SKP1... VG.../VL... pe 7636z12/0502 7/13

8 VGH... functioning principle Sectional view of valve Strainer Fully closed 7636z06e/0100 Strainer Fully open Application example VGH... complete with SKP2... Sectional view VGH... complete with SKP2... SKP2... VGH z16/0303 Luft / Air 8/13

9 Flow chart For fully open valves only p mbar 7636d01e/1103 VGG VGF m / h 1 Natural gas m / h 2 Propane m / h 3 Town gas m / h 4 Air 1/2" 3) 3/4" 3) 1" 3) VGH 1) DN40; 1 1/2" Flow chart DN50; 2" DN65 DN80; 3" DN80 1) Corresponding to fully open valve or governor 2) Without strainers 3) Flow rate of valves with throttle 20 % lower DN100 DN125 For control performance reasons, when using the SKP20... actuators with integrated governor, the nominal valve size should not be too large. This applies in paricular to burners burning small amounts of gas in the low-fire position and to burners changing from high-fire to low-fire in less than 5 s. Conversion factors 1 Natural gas Liquefied petroleum gas Town gas Air f = 1 Calculation fo factor "f" For other types of gases 1 f = dv (gas) dv = density ratio to air Iff possible select flow rate within bold lines! Flow rate m 3 / air x Wobbe number (MJ/m 3 ) = burner output (MJ/h) Calculation example Available pressure drop across the valve 2 mbar Required flow rate 60 m 3 /h natural gas Selection according to chart DN1 1/2" (point of intersection of 2 mbar and 60 m 3 /h natural gas) Legend Maximum flow (valve fully open) 1) The valve curves shown represent valves with no trainer. Each strainer reduces the flow rate by about 8 %. The bold curves correspond to the recommended pressure drop ranges. Valves with higher pressure drops can cause excessive flow noise. Applications within the area of the bold characteristics (max. 70 m/s) are within acceptable flow noise levels. 9/13

10 Note: In the case of burners with low-fire flow rates, select a tightly sized valve (refer to Data Sheet on SKP...) If the available gas pressure exceeds the maximum permissible operating pressure, lower it with an upstream pressure controller The pressure drop (curves of maximum flow) is based on a fully open valve Conversion Conversion of air flow rate to a corresponding gas flow rate (natural gas): Basis for scale Abscissa Volumetric flow «QG» in m³/h Density ratio «dv» to air Conversion factor 1 f = dv 1 Air Natural gas Propane Town gas Conversion to air (m³/h) from other types of gas: QL = QG f QL = air volume in m³/h that produces the same pressure drop as «QG» When used in connection with actuators having an integrated governor, the nominal valve size should not be selected too large to ensure good control performance. 10/13

11 Dimensions Dimensions in mm VGH... / DN E G 3/4 P N M L Q J H R 4 x Rp 1/4 S T A B K 7636m05/0502 F VGF... / DN x Rp 1/4 P 86 S T C D Q N M L J R A B K E F 7636m04/ /13

12 Dimensions (cont d) Dimensions in mm VGF... / DN G G Rp 1/4 86 Rp 1/4 P Q N M L R 80 C D J H 2 x G 3/4 S E F A B K 7636m07/0502 VGG3 G 86 G Rp 1/4 Rp 1/4 J H DN SW 2 x G 3/4 T DN C D E 80 F 7636m08/ /13

13 Dimensions (cont d) Dimensions in mm VGG ½ JDN DN C D SW 4 x Rp 1/4 S T 80 E F 7636m01/0502 Mounting surface for SKP... actuator or AGA60 adapter flange for SQX... actuator Table of dimensions Type DN ¹) A B C D E F G G H J K L M N P Q R S T SW* kg VGG... ½ ¾ ½ VGF... DN DN DN DN VGH... DN DN DN DN Nominal size, dimension for connection of medium 1) Flanges conforming to ISO R Number of boreholes For standards for flanges and threads, refer to «Type summary valves» * Width across flats 2003 Subject to change! 13/13